beginning NServiceBus and dependancy injection and instances - c#-4.0

Question

Im having some problems with NServiceBus, I can get the pubsub example working fine, but now I'm trying to integrate it into a production project and I cant get the thing to work!
My publisher code is exactly the same as the publisher example (I've just imported the project to rule out any other issues) but I then create a void function and call it from my WPF app and I get a "you cant call bus without creating an instance of bus" error
public void RunTest()
{
var eventMessage = new MarketPriceMessage();
eventMessage.Ticker = "IBM";
eventMessage.DataType = "Bid";
eventMessage.Value = (decimal)23.23423;
eventMessage.EventId = Guid.NewGuid();
eventMessage.Time = DateTime.Now; // > 30 ? (DateTime?)DateTime.Now : null;
eventMessage.Duration = TimeSpan.FromSeconds(99999D);
Bus.Publish(eventMessage);
}
Any ideas as to whats going on there and where I'm going wrong?
Following #Adam's comments below this is the code I'm using internally in my WPF App:
public partial class App : Application
{
public IBus bus { get; set; }
protected override void OnStartup(StartupEventArgs e)
{
base.OnStartup(e);
NServiceBus.Configure.With()
.Log4Net()
.SpringBuilder()
.XmlSerializer()
.MsmqTransport()
.UnicastBus()
.LoadMessageHandlers()
.CreateBus()
.Start();
}
}
}
and
namespace WpfApplication2
{
class EndpointConfig : IConfigureThisEndpoint, AsA_Publisher { }
}
and
namespace WpfApplication2
{
public class SubscriptionAuthorizer : IAuthorizeSubscriptions
{
public bool AuthorizeSubscribe(string messageType, string clientEndpoint, string clientWindowsIdentity, IDictionary<string, string> headers)
{
return true;
}
public bool AuthorizeUnsubscribe(string messageType, string clientEndpoint, string clientWindowsIdentity, IDictionary<string, string> headers)
{
return true;
}
}
}
App Config
<configuration>
<configSections>
<section name="MsmqTransportConfig" type="NServiceBus.Config.MsmqTransportConfig, NServiceBus.Core"/>
<section name="UnicastBusConfig" type="NServiceBus.Config.UnicastBusConfig, NServiceBus.Core"/>
</configSections>
<MsmqTransportConfig
InputQueue="WpfApplication2InputQueue"
ErrorQueue="error"
NumberOfWorkerThreads="1"
MaxRetries="5"/>
<UnicastBusConfig>
<!--DistributorControlAddress="" DistributorDataAddress="" ForwardReceivedMessagesTo="">-->
<MessageEndpointMappings>
</MessageEndpointMappings>
</UnicastBusConfig>
When I'm stepping through my code I can see that bus is a null object.
I am including the references as normal

Answer 1

I'm not too familiar with WPF, but it looks like there is an Application.Startup event that may work. You need to "manually" configure the bus as shown here in the docs

Answer 2

If you're not using Autofac or some other container, the problem is you skipped the assignment to your bus variable. I normally put this in Global.asax Application_Startup, but this way should work too.
If you are using a container, and you register the class that implements your ServiceContract, you can get away with having a local IBus constructor/property injected when it's instantiated.
public IBus bus { get; set; }
protected override void OnStartup(StartupEventArgs e)
{
base.OnStartup(e);
bus = NServiceBus.Configure.With() // keep a reference to the returned bus.
.Log4Net()
.SpringBuilder()
.XmlSerializer()
.MsmqTransport()
.UnicastBus()
.LoadMessageHandlers()
.CreateBus()
.Start();
}